High frequency generator



A ril 9, 1935. J. SCHLOEMILCH 1,997,019

HIGH FREQUENCY GENERATOR Filed MaiCh l6, l929 WQ (La- ,adu

. Patented Apr. 9, 1935 UNITED STATES PATENT OFFICE HIGH FREQUENCY GENERATOR Joachim Schloemilch, Berlin-Lichterfelde, .Ger-

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Application March 16, In Germany 5 Claims.

In the production of very short waves, the

capacitance and inductanceof the leads connect-v located outside the tubes, but beyond this frequency the capacity and inductance of leads assume such high values that substantial increase in frequency is no longer possible.

The present invention. provides ways and means to confine all of the circuit elements of a short-wave generator within a glass vessel in order to permit the production of substantially higher frequencies by the adoption of appropriate arrangements; especially, it dispenses with connecting leads.

The method of confiningcircuit elements within a glass vessel or bulb is, per se, well known; but what is novel is the idea of sealing the tuning means inside the exhaust glass vessel so as to make the connecting leads between them and the diiferent parts of the tube (filament, grid, plate) of minimum length.

The accompanying drawing shows an exemplification of a short-wave generator in a push-pull circuit scheme, the fundamental principle of which is shown in Fig. 1.- Fig. 2 shows a possible disposition of the circuit elements inside the tube.

The two-electrode systems R and R1 which are sealed or welded by fusion to glass bridges are directly united with inductances L and L1. Leads A, B, C, for the supply of filament and plate potential are brought out through the glass stem or foot. Variation of frequency is effected by capacitive means, for example, by means of two sheets D and D1 weldedto the plates and capacitively coupled by means of a sheet cylinder or the like (E). In Figure 2, K K, G G, P P denote the filaments, grids and plates, respectively, of the systems R and R1. The filaments or cathodes K K are assumed to be of the direct series heated type as illustrated in the key diagram. The supply of plate potential is effected at point B. Re-

generative coupling is provided between conductors L and LI. The tuning capacity is the ca- ,"pacity between the surfaces D. and DI. The small dots shown in Figure 2 indicate the seals or junctions of the connections. The useful or load circuit (antenna circuit) is arranged outside assignor to Telefunken Gesellschaft fiir Drahtlose 'Iclegraphie m.

b. 11., Berlin, Ger- 1929, Serial No. 347,718 April 21, 1928 the discharge vessel and is in inductive coupling relationship with the oscillating electrode system. Another means, of an inductive nature, for

varying the frequency is to approach a shortcircuiting ring to the inductance L or L1.

' I claim:

tainer, but physically unconnected with any of the elements within said tube for varying the' frequencies of oscillations generated.

2. An arrangement as defined in claim 1 characterized in this, that said pair of elements com- .prise sheets attached to said anodes.

3. An oscillation generator comprising within a single envelope two paths of electron streams, each path comprising a cathode, anode and control electrode, the corresponding electrodes of l. A generator of high frequency waves comboth said paths being joined together within said envelope by conductors, a connection within said envelope between said cathodes and the conductor joining said control'electrodes, an external source of energy in circuit with said cathode and a connection from said source to the conductor joining said anodes, and a connection external of said envelope and physically separated from any of the electrodes, coupled through said' envelope to a pair of said corresponding electrodes.

4. An oscillation generator of the type defined in claim 3 characterized in this, that said external connection is coupled 'capacitively between said anodes.

5. An oscillation generator comprising two space current devices within a single envelope, conductors within said envelope connecting corresponding electrodes of the two space current devices together, ,and' a connection external of said envelope capacitively connecting together one pair of said corresponding electrodes, said connection being physically separated from the elements within said conductor. I

JOACHIM SCI-ILOEMILCH. 

